Filter for aquarium



FIG. 1 is a perspective view of a filter for aquarium showing my newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown represent portions of a filter for aquarium andform no part of the claimed design.

CLAIM The ornamental design for a filter for aquarium, as shown anddescribed.